Testing the use of CXMS and DBS for weld inspection.

Mössbauer spectroscopy with scattered conversion X-ray registration (CXMS) and positron-electron annihilation (Doppler broadening spectroscopy) were tested with regard to their use in inspecting stainless steel welds. CXMS Mössbauer spectra were measured in scattering geometry with secondary X-ray radiation (energy 6.4 keV) recorded by a 2π gas flow detector. The spectra were recorded in 512 channels. The experimental data were processed using the MossWin 4.0 program. The energy scale was calibrated using pure alpha-iron. Doppler broadening spectroscopy measurements were performed using an HPGe semiconductor detector (Camberra), data accumulation was performed using a multichannel amplitude analyzer (LYNX) and GENIE software. The source of positrons was radioactive 22Na. As a result, no change was observed by Mössbauer spectroscopy, i.e., there were no changes in structural or phase composition. Positron annihilation (Doppler broadening spectroscopy) showed a reduction in defect concentration in areas close to the weld. The reduction in defect concentration is related to the heating of areas close to the weld.